The 38-year-old actor takes on the lead role in the action film directed by his father.
He told Hindustan Times: "At the moment, I haven't signed anything besides Krrish 3. So I am going to be out of work after wrapping it up.
"None of [the work rumours] are true. Immortals is just an idea and so far, it hasn't taken any shape. As for Paani, there's no development from my front. I am yet to decide what I am going to do next.
"I don't know. Maybe I am waiting for the right script to inspire me. Or possibly, people who have something inspirational (in terms of script and storyline) aren't coming to me."
Hrithik compiled a video montage celebrating his director father Rakesh Roshan's 25-year filmmaking career.
In July, the Krrish 3 helmer said that he does not think Bollywood can compete with Hollywood cinema.